Dear いくとん ,
On behalf of Saigon Hotel, we thank you for choosing to stay with us. Thank you for taking the time to share your valuable comment.
I'm sorry you were disappointed by some elements of your visit and have shared your feedback with us. I do hope we will have the opportunity to welcome you again and that next time.
Sincerely,

Dear Sir/Madam,
Thank you for staying with us at Saigon Hotel. I'm delighted that you enjoyed your time in Saigon and appreciate you taking the time to share this review. We all look forward to your next visit.
Warm regards,

Dear あいうえお,
Thanks for choosing Saigon Hotel and I'm glad you enjoyed our very central location.
I'm really sorry you were disappointed by your stay with us. We are working hard to improve our facilities and to provide a high of service and recognition, and I apologize that we failed to deliver during your visit.
Please don't hesitate to contact me if I can assist with a future stay.
Best Regards,